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From Robert Coli <>
Subject Re: Why don't you start off with a "single & small" Cassandra server as you usually do it with MySQL ?
Date Tue, 27 Aug 2013 17:36:27 GMT
On Tue, Aug 27, 2013 at 3:04 AM, Aklin_81 <> wrote:

> But so far what I have seen, it's something very different with Cassandra.
> People usually recommend starting out with atleast a 3 node cluster, (on
> dedicated servers) with lots & lots of RAM. 4GB or 8GB RAM is what they
> suggest to start with. So is it that Cassandra requires more hardware
> resources in comparison to MySQL,  for a website to deliver similar
> performance, serve similar load/ traffic & same amount of data. I
> understand about higher storage requirements of Cassandra due to
> replication but what about other hardware resources ?

If you have enough data to fit on a single computer, or two computers, and
only need one or two copies of it for redundancy/availability... you
probably don't have enough data to need something like Cassandra.
Vertically scaling RDBMS or in-memory k/v stores to significant size is a
tried and true technique. If you may eventually have more data than can fit
on a single very powerful computer, Cassandra or something like it may be
indicated. It really starts to shine once you have N>=3, because then you
can have RF>=3, which allows you to use QUORUM reads and writes for
consistency. But because Cassandra is designed for horizontal scaling (and
because it runs in the JVM...) it is natural that it will slightly
underperform from the perspective of vertical scaling.


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